JP3004616U - Ratchet wrench - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a ratchet wrench that can be easily attached / detached by changing the length of the handle even when the bolt / nut to be attached / detached is located in a recessed place. [Structure] A ratchet mechanism is attached to the tip of a handle portion of a predetermined length, and an extension bar can be connected to a rotating shaft of the ratchet mechanism. A connecting portion 4 for connecting the above is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention makes it possible to easily attach / detach bolts / nuts that cannot be handled by the conventional ratchet wrench due to the fact that the handle part is variable in length so that it is in a recessed place or is obstructed by obstacles. Regarding the ratchet wrench made possible.

[0002]

[Prior art]

 5 to 10 show an example of the conventional ratchet wrench. In this ratchet wrench 50 shown in FIG. 5, a ratchet mechanism 52 is provided at the tip of a handle 51, and a small prismatic engagement protrusion 53 is provided on the rotation shaft thereof. As shown in FIGS. 6 and 7, one of the head replacement units 60A and 60B of various types and sizes is selected and detachably fitted. The head replacement units 60A, 60B are provided with pinching portions 61A, 61B for pinching the heads of nuts and bolts on the tip side, and a fitting hole 62 for inserting the engaging projection 53 on the base end side. It is provided. Then, as shown in FIG. 8, the engaging balls 55 housed in the embedding holes 54 on the side surfaces of the engaging protrusions 53 in a partially protruding state are moved into the fitting holes 62 by the pressing force of the extension springs 56. It is pressed against the wall. Further, the ratchet wrench 50 is prepared in several types having different lengths of the handle portion 51, and one suitable for each use place is used properly. Further, the ratchet wrench 50 is provided with an extension bar 70 as shown in FIG. As shown in FIG. 10, this extension bar 70 has a fitting hole 71 provided on the base end side thereof fitted into an engaging projection 53 of a ratchet mechanism 52, and an engaging projection 72 provided on the distal end side. By fitting the head replacement units 60A and 60B into the fitting holes 62, the bolts and nuts in the recessed places can be attached and detached.

[0003]

[Problems to be solved by the device]

 The conventional ratchet wrench having the above-mentioned structure is extremely convenient because various types of head replacement units 60A, 60B can be replaced easily and reliably. However, for example, when the automobile is repaired, even if it is desired to attach / detach the bolt / nut in the recessed position, the length of the handle 51 is fixed, so the head replacement units 60A, 60B are You may be in trouble if you do not receive it. However, if the handle 51 is made longer, it is not rational because it makes it difficult to work under extremely normal conditions. Alternatively, even if it is desired to attach / detach the bolt / nut in the recessed position, there are many cases in which it cannot be executed due to obstacles that hinder the rotation operation of the handle (see FIG. 3). Therefore, an object of the present invention is to make the length of the handle variable even if the bolt / nut to be attached / detached is in a deep place or there is an obstacle that obstructs the rotation of the handle. Therefore, it is to provide a ratchet wrench capable of overcoming this obstacle.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a ratchet wrench according to the present invention is one in which a ratchet mechanism is attached to the tip of a handle portion of a predetermined length, and an extension bar can be connected to the rotating shaft of the ratchet mechanism. Then, the connecting portion 4 for connecting the extension bar 70 is provided at the base end of the handle 1.

[0005]

[Action]

 If the head of the handle 1 cannot be reached because the bolts / nuts to be attached / detached are located deep inside, the connecting part 4 provided at the base end of the handle 1 may have several types of pre-prepared parts. The ratchet wrench can be operated safely and reliably by simply selecting and connecting one of the extension bars 70 of length. Further, when the extension bar 70 connected to the handle portion 1 is being rotated, if the obstacle bar comes into contact with the obstacle portion, the extension bar 10 is once removed and the handle portion 1 that does not interfere with the obstacle portion is removed. If the ratchet mechanism is rotated to advance one frame and the extension bar 70 is connected again, the ratchet wrench can be continuously operated.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the ratchet wrench A of this embodiment shown in FIG. 1, a ratchet mechanism 2 having a well-known structure is attached to the head of a handle 1 having an extremely general length. The head portion is pin-connected to the handle portion 1, so that the head portion can be swung according to the situation of the place of use of the ratchet wrench.

A connecting portion 4 for connecting the base end side of the extension bar 70 is provided at the base end (hand side) of the handle 1. The structure of the connecting portion 4 is the same as that of the fitting holes 62 of the head replacement units 60A and 60B described in the section of the prior art.

As described above, the ratchet wrench A is provided with the extension bar 70, which plays a role of extending the engaging projection 3 provided on the rotation shaft of the ratchet mechanism 2. A fitting hole 71 having the same structure as the connecting portion 4 provided in the handle 1 is provided on the proximal end side of the extension bar 70, and an engaging projection 72 having the same structure as the engaging projection 3 is provided on the distal end side. ing.

Next, the operation of the above configuration will be described. When using the ratchet wrench A in an ordinary place where there are no obstacles around it, select head replacement units 60A and 60B of a type that matches the shape and size of the bolts and nuts to be attached and detached, and fit them. The hole 62 may be fitted in the engaging projection 3 and used in the same manner as in the conventional technique.

However, as shown in FIG. 3, when the bolt / nut 20 to be attached / detached is in a recessed position where the head of the ratchet leech A cannot be approached, the following operation may be performed. . That is, by selecting an extension bar 70 having an appropriate length from among several kinds of prepared extension bars 70, and fitting the engaging projection 72 at the tip thereof to the connecting portion 4 at the base end of the handle 1. The length of the handle portion 1 can be easily extended. If the longest extension bar 70 is added and the length is still insufficient, another extension bar 70 may be connected to the proximal end side of the extension bar 70.

However, in the state where the extension bar 70 is connected to the handle portion 1, the extension bar 70 is partially rotated as shown in FIGS. 3 and 4 (a) during the rotation operation of the ratchet wrench A. In some cases, the obstacle 30 disturbs the ratchet wrench A so that the ratchet wrench A cannot be rotated. In such a state, as shown in FIG. 4 (b), the extension bar 70 is once removed, the handle 1 that does not interfere with the obstacle 30 is rotated, and the ratchet mechanism 2 is advanced one frame. In addition, if the extension bar 70 is connected again, the extension bar 70 will be in a state of overcoming the obstacle 30 and the ratchet wrench A can be continuously operated without any trouble.

In the above structure, the object of the present invention can be achieved even if the detailed structure is appropriately changed in design. For example, the fitting structure for detachably fitting the engagement protrusions 3, 72 and the connecting portions (fitting holes) 4, 71 is not limited to the illustration, of course, and can be selected from various known fitting structures. You may select as appropriate.

[0013]

[Effect of device]

 As is apparent from the above description, the use of the ratchet wrench according to the present invention provides excellent practical effects as listed below. (A) By connecting an extension bar of any length to the connecting part provided at the base end of the handle, even a bolt or nut in a place that cannot be reached by a normal ratchet wrench can be easily attached and detached. (B) Also, with the extension bar connected to the handle, even if the extension bar interferes with the obstacle during the turning operation, the extension bar was once removed and the obstacle was overcome. Moreover, the ratchet wrench can be operated without any trouble by the method of reconnecting. (C) You can operate the ratchet wrench safely, accurately, and quickly without having to force your arm into a complicated and dangerous place. (D) Unlike conventional methods, it is no longer necessary to prepare several types of ratchet wrench with different handle lengths to suit the situation of various places of use, which is inconvenient and uneconomical in use. Disappears.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a state in which an extension bar is connected to the handle portion.

FIG. 3 is a vertical sectional view showing an example of a usage state of the same.

FIG. 4 is a diagram explaining that the ratchet wrench can be operated even when the extension bar interferes with an obstacle.

FIG. 5 shows a conventional example and is a perspective view of a ratchet wrench.

FIG. 6 is a perspective view showing an example of the head replacement unit of the above.

FIG. 7 is a perspective view showing another example of the head replacement unit of the above.

FIG. 8 is an explanatory diagram showing a state in which the head replacement unit of FIG. 7 is fitted to the head of the ratchet wrench.

FIG. 9 is a perspective view of an extension bar of the same.

FIG. 10 is an explanatory diagram of a usage state of the extension bar of the above.

[Explanation of symbols]

 A ratchet wrench 1 handle 2 ratchet mechanism 3 engaging protrusion 4 connecting portion 20 bolt / nut 30 obstacle 50 ratchet wrench 51 handle 52 ratchet mechanism 53 engaging protrusion 54 embedding hole 55 engaging ball 56 extension spring 60A, 60B Head replacement unit 61A, 61B Clamping portion 62 Fitting hole 70 Extension bar 71 Fitting hole 72 Engaging protrusion

Claims (1)

[Scope of utility model registration request] 1. A ratchet mechanism is attached to the tip of a handle having a predetermined length, and an extension bar can be connected to the rotating shaft of the ratchet mechanism. Connection part 4 for connecting the bar 70
Ratchet wrench characterized by having.